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Gene MAP2K1
Variant E203K
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions MAP2K1 E203K lies within the protein kinase domain of the Map2k1 protein (UniProt.org). E203K confers a gain of function to the Map2k1 protein as demonstrated by constitutive Erk phosphorylation (PMID: 22197931, PMID: 29483135) and cell transformation in culture (PMID: 22197931), and is associated with drug resistance in the context of BRAF V600E in culture (PMID: 28986383).
Associated Drug Resistance Y
Category Variants Paths

MAP2K1 mutant MAP2K1 act mut MAP2K1 E203K

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Transcript NM_002755.4
gDNA chr15:g.66481793G>A
cDNA c.607G>A
Protein p.E203K
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_002755 chr15:g.66481793G>A c.607G>A p.E203K RefSeq GRCh38/hg38
NM_002755.4 chr15:g.66481793G>A c.607G>A p.E203K RefSeq GRCh38/hg38
NM_002755.3 chr15:g.66481793G>A c.607G>A p.E203K RefSeq GRCh38/hg38

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  • Use quotes to match on a longer phrase with spaces (i.e. "mtor c1483f")

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
MAP2K1 mutant Erdheim-Chester disease sensitive Cobimetinib Guideline Actionable Cotellic (cobimetinib) is included in guidelines as preferred first-line or subsequent-line therapy for patients with Erdheim-Chester disease harboring mutations in the MAPK pathway such as ARAF, NRAS, KRAS, MAP2K1/2, PIK3CA, or with no detectable mutations, or for whom testing is not available (NCCN.org). detail...
MAP2K1 mutant Erdheim-Chester disease sensitive Trametinib Guideline Actionable Mekinist (trametinib) is included in guidelines as first-line or subsequent-line therapy for patients with Erdheim-Chester disease harboring mutations in the MAPK pathway such as ARAF, NRAS, KRAS, MAP2K1/2, PIK3CA, or with no detectable mutations, or for whom testing is not available (NCCN.org). detail...